Leaf photosynthesis and carbohydrate dynamics of soybeans grown throughout their life‐cycle under Free‐Air Carbon dioxide Enrichment

Rogers, Alistair; Allen, D. M.; Davey, Phillip; Morgan, Patrick B.; Ainsworth, Elizabeth A.; Bernacchi, Carl J.; Cornic, Gabriel; Dermody, Orla; Dohleman, Frank G.; Heaton, Emily A.; Mahoney, John R.; Zhu, Xin Guang; DeLucia, Evan H.; Ort, Donald R.; Long, S. P.

doi:10.1111/j.1365-3040.2004.01163.x

Cited by 189 publications

(189 citation statements)

References 37 publications

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“…An adaptation response to elevated CO 2 stress was observed. This was in accordance with reports that the ratio of free minor amino acids at elevated CO 2 to that at current CO 2 was significantly greater [52]. On the contrary, melia recorded a significant decrease in total free amino acid contents when the high concentration of CO 2 was supplied.…”

Section: Discussionsupporting

confidence: 93%

Growth, physiological and biochemical responses of Meliaceae species - Azadirachta indica and Melia dubia to elevated CO2 concentrations

Janani¹,

Priyadharshini²,

Jayaraj³

et al. 2016

J App Biol Biotech

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Response of two important tropical tree species of Meliaceae (Azadirachta indica -neem and Melia dubiamelia) to elevated levels of CO2 (600 and 900 ppm) under simulated temperature and moisture regimes in Automated Open Top Chambers was studied. Growth, biochemical changes, antioxidant property and gas exchange parameters were estimated. The results indicate that A. indica is expected to acclimatize under elevated CO2 concentrations whereas M. dubia was observed to be a species sensitive to elevated CO2 concentrations, affecting the photosynthetic machinery, stomatal conductance and transpiration and a subsequent decrease in carbohydrates, proteins, sugars, amino acids and phenolics. The short-term and long-term responses with respect to stomatal conductance and transpiration rates were higher in neem than melia. Thus, a positive response of neem to increased CO2 concentrations is a good indication for its future establishment in potentially changed climatic conditions.

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Section: Discussionsupporting

confidence: 93%

Growth, physiological and biochemical responses of Meliaceae species - Azadirachta indica and Melia dubia to elevated CO2 concentrations

Janani¹,

Priyadharshini²,

Jayaraj³

et al. 2016

J App Biol Biotech

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show abstract

“…The sample numbers in the figures (n = 4-9) refer to the number of species in different loading categories (Table I). We chose to sample leaves at midafternoon because (1) maximum accumulation of transport sugars and starch occurs at midafternoon instead of midday under natural conditions (Zhou et al, 2001;Rogers et al, 2004), and (2) E and c leaf are still in steady state at midafternoon under saturating light and K p remains stable from midday through midafternoon (Hubbard et al, 1999;Tsuda and Tyree, 2000). Prior to sampling on the same day, gas-exchange measurements were also made with a CIRAS-1 system on five fully exposed leaves per species from 10:30 AM to 1:00 PM (Supplemental Table S1) to ensure that the plants to be sampled were not under water stress.…”

Section: Sampling and Measurements Of K Pmentioning

confidence: 99%

Phloem Loading Strategies and Water Relations in Trees and Herbaceous Plants

Cheng

Guo

et al. 2011

Plant Physiology

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Most herbaceous plants employ thermodynamically active mechanisms of phloem loading, whereas in many trees, the mechanism is passive, by diffusion. Considering the different water transport characteristics of herbs and trees, we hypothesized that water relations play a role in the adoption of phloem loading strategies. We measured whole-plant hydraulic conductance (K p ), osmolality, concentrations of polar metabolites, and key inorganic ions in recently mature leaves of 45 dicotyledonous species at midafternoon. Trees, and the few herbs that load passively, have low K p , high osmolality, and high concentrations of transport sugars and total polar metabolites. In contrast, herbs that actively load sucrose alone have high K p , low osmolality, and low concentrations of sugars and total polar metabolites. Solute levels are higher in sugar alcohol-transporting species, both herbs and trees, allowing them to operate at lower leaf water potentials. Polar metabolites are largely responsible for leaf osmolality above a baseline level (approximately 300 mM) contributed by ions. The results suggest that trees must offset low K p with high concentrations of foliar transport sugars, providing the motivating force for sugar diffusion and rendering active phloem loading unnecessary. In contrast, the high K p of most herbaceous plants allows them to lower sugar concentrations in leaves. This reduces inventory costs and significantly increases growth potential but necessitates active phloem loading. Viewed from this perspective, the elevation of hydraulic conductance marks a major milestone in the evolution of the herbaceous habit, not only by facilitating water transport but also by maximizing carbon use efficiency and growth.

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“…3). FACE experiments with soybean (Glycine max) and clover (Trifolium repens) showed a stimulation in photosynthetic C uptake and leaf carbohydrate content at elevated [CO 2 ] (Ainsworth et al, 2003b;Rogers et al, 2004;Leakey et al, 2009;Fig. 3).…”

Section: Why Is Elevated [Co 2 ] Particularly Beneficial For Legumes?mentioning

confidence: 99%

Will Elevated Carbon Dioxide Concentration Amplify the Benefits of Nitrogen Fixation in Legumes?

2009

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Leaf photosynthesis and carbohydrate dynamics of soybeans grown throughout their life‐cycle under Free‐Air Carbon dioxide Enrichment

Abstract: ); PPFD ¢ , daily integral of PPFD; Rubisco, ribulose-1,5-bisphosphate carboxylase oxygenase; T leaf , leaf temperature ( ∞ C); TNC, total non-structural carbohydrate (mmol m -2 ); VPD, vapour pressure deficit (kPa).

Cited by 189 publications

References 37 publications

Growth, physiological and biochemical responses of Meliaceae species - Azadirachta indica and Melia dubia to elevated CO2 concentrations

Growth, physiological and biochemical responses of Meliaceae species - Azadirachta indica and Melia dubia to elevated CO2 concentrations

Phloem Loading Strategies and Water Relations in Trees and Herbaceous Plants

Will Elevated Carbon Dioxide Concentration Amplify the Benefits of Nitrogen Fixation in Legumes?

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